Place bread cubes in a shallow bowl. Mix oil, vinegar, tomatoes, onion and half of the herbs in a medium bowl. Let stand so that flavors can meld, about 10 minutes, then add to bread, along with remaining herbs and toss well. Season with salt and pepper, using extra to taste if necessary. If bread is still dry, sprinkle 1 or 2 tablespoons water to rehydrate it a bit. Serve. Note: If sturdy bread is used, salad can be covered and set aside for up to 2 hours.